I have been wanting to try this for a long while. I have an area completely mapped in my head, so detailed I can easily walk through (and re-visit) areas in my mind. However, as I am in an extremely long dry spell I haven't been able to try to visit.

I predict as long as you are in decent control of the dream, getting to the location would not be that difficult. As for retaining it's details and familiarity, I assume it would take multiple visits to finally establish the location. Once you have been there multiple times and are extremely familiar with the feeling and "presence" of the location, I can imagine it would reform much more naturally each visit until no effort is required (theoretically, of course).